Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef172a254e26676…

MALICIOUS

PDF

88.8 KB Created: 2021-07-23 02:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f79528404d8b39e8c6c1ecb82374b1e SHA-1: 8cc11dfb64c62f09465c9aba61295413a7998a1e SHA-256: 8ef172a254e266760b86db3dd664cac770f62a32c4a3bfec48815bb62346a3c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous URLs, some of which are hosted on compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://morethancars.nl/uploads/edytor/file/59669603699.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8m5jqjd1npbgkqb65ff2mj5g0/dipiz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb20590457---vifitarud.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/488lfcnrvbbmc82vc82ae9augp/29695906523.pdfIn PDF document text
    • https://mollis.rs//files/lufudajowuvuvumaroboxugu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f221a124b257831e7f59ba6c150a9b94/25851559075.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6ca6443cd74012ff0040aad5604e78d4/7752769707.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be3f72734757a70b39ec6eb4324e7653/poniwefavanokeve.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nitobowilasetugeka.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/72626163985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609638d58ac7b---61398265777.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/59619135340.pdfIn PDF document text
    • http://beateromer.com/bilder/file/82535057827.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61947c4ca---zerevoludolazapuxabob.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fffbcee98d8245d01bf462cd96a8a90a/18963718999.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/46102338432d1a69f735fb0ed1394a35/pixetijusubopokilepu.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/wapojebarovarukebal.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/42480686046.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cafcbea86---60166239990.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/kegatotegoj.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210603165526.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8302d43fcc92834dfb4476d5bd0ca30c/43320020437.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923d36bf0d---fakuxuxazinesazojawupolol.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/sediribirovojomo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607765fab2ba1---16608902146.pdfIn PDF document text
    • http://industrialdevices.in/uploads/timave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+am+talking+to+you+in+frenchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 18760 bytes
SHA-256: e4cf0ed998dae949f947ab15743f247b28eeab68a3472d31fd79583ec38c710a
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 10872 bytes
SHA-256: 5d0ea1cba6865c4519d234ad6fd5dfa4018c98a05f60d1a903c36e3cb6d93a39

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